| Patent Number |
Title Of Patent |
Date Issued |
| 4848085 |
Oil-well pumping system or the like |
July 18, 1989 |
| The invention involves pressure-counterweighted oil-well pumping apparatus in which derrick structure of elemental simplicity involves components which are readily assembled and disassembled, such that a given pumping apparatus can be loaded on a single truck and transported from one to |
| 4801126 |
Hydraulically operated lift mechanism |
January 31, 1989 |
| A three-chamber jack employs a telescoping relation between an outer cylinder and an intermediate cylinder, the closed outer ends of which cylinders continuously sustain lifting-load force. An annular piston is fixed to the inner end of the intermediate cylinder and has sealed sliding |
| 4761954 |
Fork-lift system |
August 9, 1988 |
| A battery-operated electric-motor driven hydraulic-lift mechanism for a fork-lift vehicle employs a hydraulic accumulator which serves an intertia-free counterweight function, designedly to the degree that such counterweight action is a direct offset of a predetermined average-load c |
| 4761953 |
Hydraulic elevator mechanism |
August 9, 1988 |
| The invention contemplates hydraulic-lift mechanism which employs a power integrator in the connection between a charged hydraulic accumulator and the actuator for a vertically positionable load; the power integrator, additionally, has a prime-mover connection, and the pressurized charge |
| 4730743 |
Hydraulically operated bridge crane |
March 15, 1988 |
| A bridge-crane structure wherein major structural components to sustain loads imposed upon the span are also major functional components of hydraulically controlled hoist mechanism of the crane. Specifically, closed upper and lower elongate cylinders are rigidly laced by struts to de |
| 4715180 |
Hydraulic lift mechanism |
December 29, 1987 |
| The invention contemplates hydraulic-lift mechanism which employs a power integrator in the connection between a charged hydraulic accumulator and the actuator for a vertically positionable load; the power integrator, additionally, has a prime-mover connection, and the pressurized charge |
| 4702076 |
Hydraulically operated clam-shell device |
October 27, 1987 |
| The invention contemplates a hydraulically operated twin-cable suspension for a clamshell or the like load-handling device. In a preferred embodiment, a charged accumulator is effectively a counterweight and is the source of all hydraulic fluid needed for the full range of actuation |
| 4686828 |
Hydraulically operated clamshell device |
August 18, 1987 |
| The invention contemplates a hydraulically operated twin-cable suspension for a clamshell or the like load-handling device. In a preferred embodiment, a charged accumulator is effectively a counterweight and is the source of all hydraulic fluid needed for the full range of actuation |
| 4665696 |
Hydraulically operated hoist for containerized freight or the like |
May 19, 1987 |
| The invention in a preferred embodiment contemplates a dual-lift hydraulic arrangement in which each of two hydraulic-lift systems employs a power integrator in the connection between a charged hydraulic accumulator and a hydraulic actuator for cable suspension of a load. The accumulator |
| 4631918 |
Oil-well pumping system or the like |
December 30, 1986 |
| The invention contemplates oil-well pumping apparatus (a) in which a traction cylinder is mounted at the well-head for direct reciprocating operation of the polish rod from which a pumping piston is suspended in a well casing, and (b) in which hydraulic-counterweight principles of co |
